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The Magmoor Caverns are, as a whole, long and narrow. There are only a few very large rooms, and most of it is subterranean, only three rooms being above the surface. Most of its rooms are superhot, and thus, Samus needs the temperature protection offered by the Varia Suit to traverse through them safely. The magma found here is extremely dangerous, and if Samus falls in, it will harm her, regardless of her current suit. A minor Space Pirate base resides here, with a small amount of technology present in other areas, such as the Flame jet.

The Magmoor Caverns are the only area in Metroid Prime that has no boss creature, although Thardus was seemingly intended for this area but was moved due to time constraints, as revealed in Mike Sneath's interview with Shinesparkers: "I am not 100% sure but if I remember correctly Thardus was suppose [sic] to be in a large lava pit arena but I believe we had to change it due to time constraints".